:root {
    --primary-color: #42b983;
    --secondary-color: #35495e;
    --border-color: #eaecef;
    --text-color: #2c3e50;
    --light-bg: #f8f8f8;
    --completed-color: #e0f5ea;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    color: var(--text-color);
    line-height: 1.5;
    background-color: white;
    padding-top: 180px;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    z-index: 100;
    padding: 20px 40px;
}

.title {
    font-size: 28px;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.daily-quote {
    font-size: 16px;
    color: var(--primary-color);
    font-style: italic;
    margin-bottom: 15px;
}

.daily-summary {
    display: flex;
    gap: 20px;
    font-size: 14px;
    padding: 10px 0;
    border-top: 1px solid var(--border-color);
}

.summary-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.summary-item .count {
    font-weight: bold;
    color: var(--primary-color);
}

.encouragement {
    color: var(--secondary-color);
    font-style: italic;
}

.container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.sidebar {
    width: 280px;
    position: sticky;
    top: 180px;
    height: calc(100vh - 180px);
    overflow-y: auto;
    padding: 20px 0;
    border-right: 1px solid var(--border-color);
}

.sidebar-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--secondary-color);
}

.tree {
    list-style: none;
}

.tree-group {
    padding-left: 15px;
}

.tree-group .group-link{
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 20px;
    font-weight: 600;
    display: block;
    margin: 10px 0;
}

.tree-item {
    padding: 5px 0;
    cursor: pointer;
    transition: color 0.3s ease;
}

.tree-item:hover {
    color: var(--primary-color);
}

.tree-item.completed {
    color: #888;
    text-decoration: line-through;
}

.tree-item a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.tree-item a:hover {
    color: var(--primary-color);
}

.tree-item .toggle {
    margin-right: 5px;
    color: var(--primary-color);
    font-size: 12px;
}

.tree-children {
    list-style: none;
    padding-left: 20px;
    margin-top: 5px;
    display: none;
}

.tree-item.expanded .tree-children {
    display: block;
}

.content {
    flex: 1;
    padding: 20px 40px;
}

.progress-container {
    margin-bottom: 20px;
}

.progress-bar {
    height: 10px;
    background-color: var(--primary-color);
    border-radius: 5px;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 14px;
    color: var(--secondary-color);
    margin-top: 5px;
}

.chapter-group {
    margin-bottom: 30px;
}

.group-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}


.chapter-list {
    list-style: none;
}

.chapter-item {
    padding: 10px 15px;
    margin-bottom: 5px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s ease;
}

.chapter-item:hover {
    background-color: var(--light-bg);
}

.chapter-item.completed {
    background-color: var(--completed-color);
}

.chapter-item.completed label {
    text-decoration: line-through;
    color: #888;
}

.completion-date {
    font-size: 12px;
    color: #888;
    margin-left: 10px;
}

/* 手机响应式设计 */
@media (max-width: 768px) {
    body {
        padding-top: 160px; /* 调整顶部间距 */
    }

    .header {
        padding: 15px 20px;
    }

    .container {
        flex-direction: column;
        padding: 0 20px;
    }

    .sidebar {
        display: none; /* 隐藏侧边栏 */
    }

    .content {
        padding: 60px 0;
    }

    .daily-summary {
        flex-direction: column; /* 打分项垂直排列 */
        gap: 10px;
    }

    .chapter-item {
        display: flex;
        flex-direction:row; /* 章节项垂直排列 */
        /*align-items: flex-start;*/
    }

    .completion-date {
        margin-left: 0;
        margin-top: 5px;
    }
}